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Verification checks whether a software work product conforms to specified requirements; validation checks whether the product meets its intended use and user needs. They are complementary verification and validation (V&V) activities, not synonyms for software testing. Testing can provide evidence for either, but so can reviews, inspections, analysis, assessments and demonstrations.
What is the difference between verification and validation?
The practical distinction is the reference point: verification compares a work product with approved requirements or specifications, while validation evaluates the product against intended use, user needs and its operating context.
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| Dimension | Verification | Validation |
|---|---|---|
| Main question | Does this work product meet the requirements allocated to this activity? | Does the product meet its intended use and user or mission needs? |
| Reference point | Approved requirements, specifications or inputs to the development activity | Intended use, concept of operations, customer needs and realistic operating context |
| Typical evidence | Reviews, inspections, analysis, demonstrations and tests tied to requirements | Evaluation with typical users or under realistic or simulated conditions, including suitability and effectiveness |
| Useful outcome | Objective evidence of conformance; defects or requirement gaps are exposed | Evidence of suitability and effectiveness for intended use; unmet needs or incorrect assumptions are exposed |
NASA’s shorthand is memorable: “Are we building the product right?” for verification, and “Are we building the right product?” for validation. The questions help distinguish the activities, but the actual test is what the evidence is being compared against: requirements or intended use. NASA’s IV&V overview describes the distinction.
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Illustrative example: a login feature
Suppose a team is developing a login and account-recovery feature. For verification, it could check whether the implementation conforms to approved requirements for account lockout, password reset and session timeout. For validation, it could evaluate whether intended users can sign in securely and recover access in the conditions where they will actually use the software.
A single test session might produce evidence for both questions, but the criteria and conclusions should remain distinct. NASA notes that verification and validation tests may be combined when justified; combining the activity does not make the two questions interchangeable. NASA’s product verification guidance discusses testing against requirements and the concept of operations.
When do verification and validation happen?
Neither activity belongs to one fixed phase. Verification can assess intermediate products at different lifecycle stages, while validation evaluates products throughout the software development lifecycle. Requirements, designs, code, integrated builds and deployed behavior can each be evaluated against the appropriate reference point.
For example, a design review can verify that a design addresses specified requirements; later, testing can verify that an implementation behaves as specified. Validation can evaluate whether a representative or finished product is suitable and effective in its intended operational context. NASA distinguishes verification testing against an approved requirements set from validation testing against the concept of operations, using realistic or simulated conditions to assess suitability and effectiveness. Its guidance also notes that verification tests can be conducted at different lifecycle stages.
Testing is only one source of V&V evidence
Executing test cases is useful, but it is not the whole of V&V. IEEE 1012-2024 identifies analysis, evaluation, review, inspection, assessment and testing across lifecycle products. NASA’s systems engineering guidance also describes verification by test, analysis, inspection or demonstration. The method should fit the claim being evaluated: a review may expose a requirements or design issue without executing software, while a dynamic test can show behavior under specified conditions.
That broader scope matters because a passing test does not by itself establish that a product meets every requirement or is suitable for users’ real needs. Teams need evidence tied to the relevant criteria and a clear record of what was evaluated. IEEE 1012-2024 is an active standard for system, software and hardware V&V.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How standards fit into software V&V
IEEE 1012-2024 covers V&V across system, software and hardware lifecycle products, including interfaces and reused products, and describes different integrity levels. The ISO/IEC/IEEE 29119 series is an internationally agreed set of software-testing standards; the ISO committee page describes its core processes in terms of organizational, management and dynamic test levels. These standards have formal scope beyond a simple mnemonic or checklist. Teams working under regulated, contractual or organizational requirements should consult the applicable standard and governing requirements; public summaries do not replace the standards text.
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IEEE 1012-2024 and the ISO/IEC/IEEE 29119 series overview are starting points for their respective scopes.
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